Roof curb for supporting a ventilator



FIG. 1 is a top and front perspective view of a roof curb for supporting a ventilator showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof; and

FIG. 5 is a cross-sectional view taken along the line 5--5 in FIG. 1. 

The ornamental design for a roof curb for supporting a ventilator, as shown and described. 